fix a segfault when callbacks don't get a header

2 files changed, 8 insertions, 2 deletions

diff --git a/NEWS b/NEWS
index a17f430..65b0641 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,5 @@
+- fix a segfault when callbacks don't get a header
+
 Version 5.04 - 26 February 2015
 
 - callbacks now get pkg name instead of just pkg id
diff --git a/URPM.xs b/URPM.xs
index f4ac459..40e3c46 100644
--- a/URPM.xs
+++ b/URPM.xs
@@ -1314,8 +1314,12 @@ static void *rpmRunTransactions_callback(const void *arg,
 	mPUSHs(newSViv(total));
       }
       // for erasures, the key provided by librpm is always 0, so let's add another parameter (fullname):
-      char *s = headerGetAsString(h, RPMTAG_NVR);
-      mPUSHs(newSVpv(s, 0));
+      if (h) {
+        char *s = headerGetAsString(h, RPMTAG_NVR);
+        mPUSHs(newSVpv(s, 0));
+      } else {
+        PUSHs(&PL_sv_undef);
+      }
       PUTBACK;
       i = call_sv(callback, callback == td->callback_open ? G_SCALAR : G_DISCARD);
       SPAGAIN;